Intermittent lithium battery charging control method and hydropower station intelligent inspection method

Abstract

The invention relates to an intermittent lithium battery charging control method and a hydropower station intelligent inspection method, and the method comprises the steps: charging a first battery module in a pre-charging mode until the parameter of the first battery module is a preset voltage value; charging the first battery module in a steady-current charging state until the parameter of the first battery module reaches the voltage-stabilizing upper limit voltage; charging the first battery module in a stable-voltage charging state until the state of the first battery module meets a first termination condition; stopping charging the first battery module until the charging condition index meets the first starting condition; and restarting charging, and entering a pre-current-limiting stage until the first battery module reaches an expected charging completion state. According to the invention, rapid charging response and efficient power supply of the special equipment for the hydropower station can be ensured in an emergency, and the equipment has the capability of continuous and stable operation, so that the operation requirements of the hydropower station are met, and the stability of a power system and the smoothness of a communication network are ensured.

Description

Technical Field

[0001] The present invention relates to the field of intelligent charging, and in particular to an intermittent lithium battery charging control method and an intelligent inspection method for a hydropower station. Background Art

[0002] Special equipment in large hydropower stations often lack efficient and reliable emergency power supply solutions when equipment failure or maintenance occurs. In addition, the natural environment of hydropower stations is complex and changeable, such as high humidity, dust, strong vibration, etc., which poses higher challenges to the durability and stability of special equipment.

[0003] Given that large hydropower stations have high requirements for the continuity and stability of special equipment, the industry needs to develop an intelligent charging solution that not only ensures fast charging response and efficient power supply in emergency situations, but also has the ability to operate continuously and stably to meet the operational needs of hydropower stations and ensure the stability of the power system and the smoothness of the communication network. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to design an intelligent charging solution that can ensure the rapid charging response and efficient power supply of special equipment of the hydropower station in an emergency, and has the ability to operate continuously and stably.

[0005] To solve the above problems, the present invention proposes an intermittent lithium battery charging control method and an intelligent inspection method for a hydropower station, which can ensure the rapid charging response and efficient power supply of special equipment of the hydropower station in an emergency situation, and have the ability of continuous and stable operation, thereby meeting the operational needs of the hydropower station and ensuring the stability of the power system and the smoothness of the communication network.

[0006] In a first aspect, an embodiment of the present invention proposes an intermittent lithium battery charging control method, which is used to realize charging of a first battery module, wherein the first battery module is connected to a monitoring unit, and the monitoring unit is in a powered-on state and is used to monitor the first battery module; the intermittent lithium battery charging control method includes: S1, charging the first battery module in a pre-charging mode until the parameters of the first battery module are preset voltage values; S2, charging the first battery module in a steady-current charging state until the parameters of the first battery module reach a regulated upper limit voltage; S3, charging the first battery module in a regulated-voltage charging state until the state of the first battery module meets a first termination condition; S4, stopping charging the first battery module until the charging condition indicator meets a first start condition; S5, restarting charging and entering a pre-current limiting stage until the first battery module reaches an expected charging completion state.

[0007] Its further technical solution is that S1 charges the first battery module in a pre-charging mode until the parameters of the first battery module are preset voltage values, including: obtaining the nominal voltage of the first battery module, reducing the nominal voltage by a preset fine-tuning ratio, and obtaining a nominal lower limit voltage; using a preset first charging current as a charging condition indicator, pre-charging the first battery module so that the charging dynamic voltage gradually increases until the charging dynamic voltage reaches the nominal lower limit voltage.

[0008] Its further technical solution is that S2 charges the first battery module in a steady-current charging state until the parameters of the first battery module reach the upper limit voltage of the voltage regulation, including: amplifying the first charging current by a preset coefficient to obtain a second charging current; adjusting the voltage value based on the nominal voltage to increase the voltage value to obtain the upper limit voltage of the voltage regulation; using the second charging current as a charging condition indicator, the first battery module is charged at a steady current, so that the charging dynamic voltage gradually increases until the charging dynamic voltage reaches the upper limit voltage of the voltage regulation.

[0009] Its further technical solution is that S3 charges the first battery module in a regulated voltage charging state until the state of the first battery module meets the first termination condition, including: taking the regulated voltage upper limit voltage as the charging condition indicator, performing regulated voltage charging on the first battery module, and maintaining the voltage stable under the state of unstable current until the state of the first battery module meets the first termination condition.

[0010] A further technical solution is that S4 stops charging the first battery module until the charging condition index meets the first starting condition, including: stopping charging the first battery module, leaving the first battery module stationary so that the charging condition index of the first battery module changes over time until the charging condition index meets the first starting condition.

[0011] Its further technical solution is that S5 restarts charging and enters the pre-current limiting stage until the first battery module reaches the expected charging completion state, including: calculating the initial pre-limited current according to the current at the current limiting point and according to the load current; restarting charging with the initial pre-limited current as the starting point, entering the pre-current limiting stage, and then adjusting the state of the first battery module according to a first adjustment rule until the first battery module reaches the expected charging completion state; the first adjustment rule is to ensure that the battery is fully charged and allow the current to change.

[0012] In a second aspect, the present invention proposes an intelligent inspection method for a hydropower station, wherein the intelligent inspection method for a hydropower station is used for an intelligent mobile charging unit to realize inspection and charging inside the hydropower station, wherein multiple special equipment inside the hydropower station is equipped with multiple battery modules; the intelligent inspection method for a hydropower station is based on the intermittent lithium battery charging control method as described in the first aspect, and after the first battery module reaches the expected charging completion state, the intelligent inspection method for a hydropower station also includes: keeping the position and distance of the intelligent mobile charging unit relative to the first battery module unchanged, and after waiting for a preset time, checking whether the parameters of the first battery module deviate from the preset parameters; if the parameters of the first battery module are found to deviate from the preset parameters, stopping the inspection of the first battery module and issuing an alarm signal.

[0013] Its further technical solution is that the intelligent inspection method of the hydropower station also includes: if it is checked that the parameters of the first battery module do not deviate from the preset parameters, the past charging records stored in the storage unit are retrieved, and the second battery module with the largest interval between the past charging time and the current moment is screened out, and the third battery module with the second smallest interval between the past charging time and the current moment is screened out; the coordinate position of the second battery module relative to the hydropower station and the coordinate position of the third battery module relative to the hydropower station are calculated, and the center position between the two is calculated, and the standard docking area closest to the center position is used as the target position for the next movement; move towards the target position for the next movement, and if no battery module in the hydropower station issues a charging demand during the movement, keep the target unchanged until entering the standard docking area.

[0014] Its further technical solution is that the intelligent inspection method of the hydropower station also includes: moving towards the target position of the next movement, if a battery module in the hydropower station issues a charging demand during the movement, the target is transferred to the fourth battery module that issues the charging demand, until it moves to a chargeable position on one side of the fourth battery module, and executes the intermittent lithium battery charging control method.

[0015] To sum up, the beneficial effects of the present invention are that it can ensure the rapid charging response and efficient power supply of the special equipment of the hydropower station in an emergency, and has the ability to operate continuously and stably, thereby meeting the operational needs of the hydropower station and ensuring the stability of the power system and the smoothness of the communication network. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic flow chart of an intermittent lithium battery charging control method provided in an embodiment of the present invention.

[0019] Figure 2 Another schematic flow chart of the intermittent lithium battery charging control method provided in an embodiment of the present invention.

[0020] Figure 3 Another schematic flow chart of the intermittent lithium battery charging control method provided in an embodiment of the present invention.

[0021] Figure 4 A block diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or other features, integers, steps, operations, elements, components and / or combinations thereof.

[0024] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0025] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to one or any combination and all possible combinations of the associated listed items, and includes these combinations.

[0026] As used in this specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0027] Example 1

[0028] See also Figures 1 to 3 , among which Figure 1 A flow chart of an intermittent lithium battery charging control method provided in an embodiment of the present invention. The embodiment of the present invention proposes an intermittent lithium battery charging control method, the method is used to realize the charging of a first battery module, the first battery module is connected to a monitoring unit, the monitoring unit is in a powered-on state and is used to monitor the first battery module; the intermittent lithium battery charging control method includes: S1, charging the first battery module in a pre-charging mode until the parameters of the first battery module are a preset voltage value; S2, charging the first battery module in a steady current charging state until the parameters of the first battery module reach a voltage regulation upper limit voltage; S3, charging the first battery module in a steady voltage charging state until the state of the first battery module meets a first termination condition; S4, stopping charging the first battery module until the charging condition index meets a first start condition; S5, restarting charging and entering a pre-current limiting stage until the first battery module reaches the expected charging completion state.

[0029] In one embodiment, the S1, charging the first battery module in a pre-charging mode until the parameter of the first battery module is a preset voltage value, includes: obtaining the nominal voltage of the first battery module, reducing the nominal voltage by a preset fine-tuning ratio, and obtaining the nominal lower limit voltage; using the preset first charging current as the charging condition indicator, pre-charging the first battery module so that the charging dynamic voltage gradually increases until the charging dynamic voltage reaches the nominal lower limit voltage. In the above scheme, the nominal voltage is reduced by a preset fine-tuning ratio, wherein the preset fine-tuning ratio can be any value less than or equal to 10%, for example, it can be 1% or 2%, mainly used to avoid the influence caused by the nominal voltage.

[0030] In the above step S1, the first battery module is charged in the pre-charging mode, that is, in the low-voltage pre-charging or recovery charging stage, the control logic mainly focuses on the initial and gentle charging of the lithium battery to ensure that the battery transitions safely and smoothly from a deep discharge state or a long-term unused state to a normal charging state; the control logic and decision basis of this stage are as follows:

[0031] First, initial state detection: detect the initial voltage of the battery to determine whether the battery is in a deep discharge state (voltage is lower than 48V); check the temperature of the battery to ensure that charging is carried out within a safe range (temperature is between 10-35 degrees); second, charging parameter setting: according to the initial state of the battery, set a lower initial charging voltage (48V) and a smaller charging current (0.1C, i.e. one tenth of the battery capacity); third, charging start: after confirming that the initial state of the battery is safe, start the charging process and charge according to the set initial charging voltage and current; fourth, real-time state monitoring: during the charging process, monitor the voltage, current and temperature changes of the battery in real time; pay special attention to the temperature change of the battery, because a deeply discharged battery may generate a lot of heat during the initial charging; fifth, dynamic adjustment: if the battery temperature is detected to be abnormally high during the charging process (exceeding the preset safety temperature of 35 degrees), the charging current should be reduced or charging should be suspended immediately to prevent the battery from overheating; if the battery voltage rises rapidly in a short period of time, it may indicate that there is a short circuit or other abnormality inside the battery. At this time, charging should be suspended and troubleshooting should be carried out.

[0032] Further, regarding how to solve the problem by dynamically adjusting the charging parameters: During the low-voltage pre-charging or recovery charging stage, dynamically adjusting the charging parameters is the key to ensuring a safe and effective charging process. The following are several common scenarios and corresponding adjustment strategies: (1) Battery overheating: If the battery temperature is detected to be abnormally high, the charging current should be reduced first to reduce the heat generated by the battery. If the temperature cannot be controlled within the safe range after reducing the current, the charging should be suspended and the battery should be allowed to cool naturally before continuing. (2) Battery voltage abnormality: If the battery voltage fluctuates abnormally during the charging process (the single cell voltage is 3.65V, lower than 2.0V, the single cell voltage rises by 0.1V / minute, or decreases by more than 0.1V / minute), charging should be suspended. (3) Charging efficiency problem: If the charging efficiency is low during the pre-charging stage (the continuous charging current is continuously lower than 0.1C within one minute), it may be due to battery aging or increased internal resistance. At this time, the charging voltage needs to be increased to 50V. If the charging current remains lower than 0.1C within one minute, charging should be suspended.

[0033] In one embodiment, the S2, charging the first battery module in a steady-current charging state until the parameters of the first battery module reach the upper limit voltage of the voltage regulation, includes: amplifying the first charging current by a preset coefficient to obtain a second charging current; adjusting the voltage value based on the nominal voltage to obtain the upper limit voltage of the voltage regulation; taking the second charging current as the charging condition indicator, the first battery module is charged with a steady current, so that the charging dynamic voltage gradually rises until the charging dynamic voltage reaches the upper limit voltage of the voltage regulation. Among them, the first charging current can be 0.1C, and the second charging current can be 0.3C. In the above scheme, the voltage value is adjusted to be larger based on the nominal voltage to obtain the upper limit voltage of the voltage regulation, wherein the voltage value is adjusted to be larger based on the nominal voltage, which can be completed by engineers in this field based on experience, or it can be completed automatically; in one embodiment, the voltage is adjusted to be larger based on the nominal voltage of 48V to obtain the upper limit voltage of the voltage regulation of 58.4V, where the basis for obtaining 58.4V is to increase the nominal voltage by 20%.

[0034] In the above step S2, the first battery module is charged in a steady-current charging state, that is, an equalizing charging mode (steady-current charging), which ensures that the battery can safely and efficiently receive electrical energy during charging; the following is a detailed supplementary description of the equalizing charging mode control logic, decision basis, and how to solve the problem by dynamically adjusting the charging parameters:

[0035] First, the control logic of the equalization charging mode: (1) Monitoring stage: The charging system first monitors the current status of the battery, including key parameters such as the battery voltage and temperature; these parameters reflect the health of the battery and the charging requirements; (2) Judgment stage: Based on the monitored parameters, the charging system determines whether the battery is suitable for entering the equalization charging mode; if the battery temperature is too high (temperature is higher than 35 degrees), it needs to be cooled first; if the voltage is too low (voltage is lower than 48V), it needs to be pre-charged before entering the equalization charging mode; (3) Execution stage: Once it is determined to be suitable for entering the equalization charging mode, the charging system will charge the battery at a constant current according to the preset charging algorithm (the default charging current is 0.3C); at this time, the charging current remains constant, while the battery voltage gradually increases; (4) Adjustment stage: During the equalization charging process, the charging system will continuously monitor the battery status and dynamically adjust the charging parameters as needed; when the battery is close to a full charge of 58.4V, the charging current may gradually decrease to 0.1C to prevent overcharging.

[0036] Second, the decision basis: (1) Battery parameters: Battery voltage, temperature and other parameters are important bases for judging the battery status and charging requirements; the charging system will decide whether to enter the equalization charging mode and how to adjust the charging parameters based on these parameters; (2) Charging strategy: Fast charging sets a charging current of 1C in the equalization charging stage, and slow charging sets a charging current of 0.1C in the equalization charging stage; (3) Safety limit: When the single cell voltage is higher than 3.6V or the battery temperature is higher than 35 degrees, the charging system will reduce the charging current to 0.1C for charging; when the single cell voltage is higher than 3.7V or the battery temperature is higher than 50 degrees, the system stops charging.

[0037] Third, dynamically adjust charging parameters: (1) Voltage feedback: During the equalization charging process (steady current charging), the charging system will continuously monitor the battery voltage; when the battery voltage is close to the preset equalization charging voltage (the single cell voltage reaches 3.6V or the entire battery pack reaches 57.6V), the charging current is reduced to 0.1C to avoid overcharging; (2) Temperature monitoring: Battery temperature is an important indicator of battery health and safety; if the battery temperature is higher than 35 degrees, the charging system will reduce 0.1C for charging; if the battery temperature is higher than 50 degrees, charging will be suspended to prevent thermal runaway.

[0038] Fourth, solve the following problems: (1) Overcharging problem: By dynamically adjusting the charging current, the battery can be prevented from being overcharged. When the battery is close to being fully charged, reducing the charging current can prevent the battery voltage from being too high. (2) Overheating problem: By monitoring the battery temperature and reducing the charging current or suspending charging when necessary, the battery can be prevented from being overheated. In addition, when the temperature is higher than 35 degrees, the battery monitoring device starts the fan to reduce the battery temperature. (3) Charging efficiency problem: Users can choose fast charging or manually set the charging current to improve charging efficiency.

[0039] In one embodiment, the S3 charges the first battery module in a regulated voltage charging state until the state of the first battery module meets the first termination condition, including: taking the regulated voltage upper limit voltage as the charging condition indicator, performing regulated voltage charging on the first battery module, and maintaining the voltage stable under the state of unstable current until the state of the first battery module meets the first termination condition.

[0040] In the above step S3, the first battery module is charged in a voltage-stabilized charging state, that is, an equalization charging mode (voltage-stabilized charging), which ensures that the battery can be charged at a constant voltage in the final stage of charging, thereby preventing overcharging and optimizing battery performance; the following is a detailed supplementary description of the control logic, decision basis, and how to solve the problem by dynamically adjusting the charging parameters in the equalization charging mode (voltage-stabilized charging) stage:

[0041] First, control logic: (1) Monitoring and judgment: When the battery voltage reaches the preset upper limit (58.4V) of the equalization mode (constant current charging) stage, the charging system begins to enter the equalization mode (constant voltage charging) stage; at this time, the charging system first monitors the battery's real-time voltage, current, temperature and other parameters to ensure that the battery is in a safe and rechargeable state; (2) Voltage control: In the equalization mode (constant voltage charging) stage, the charging system will control the voltage at a preset constant voltage value, while allowing the charging current to gradually decrease; the charging current decreases because as the battery power increases, the battery's internal resistance increases. , resulting in a decrease in the battery's ability to receive current; (3) Termination conditions: that is, the first termination condition, condition 1 when the charging condition reaches the preset equalization charging protection time (default 24 hours), condition 2 the charging voltage reaches the set value and the charging current is less than 0.01C, condition 3 the charging current is less than 0.01C10 and the duration is greater than the set value (default 3 hours), condition 4 the rectifier module communication is completely interrupted, condition 5 the system is abnormal, the equalization charging mode (voltage-stabilized charging) stage ends, and one of the above conditions 1 to 5 is met, that is, the "first termination condition" is reached or met, and the charging system enters the next stage.

[0042] Second, decision-making basis: (1) Battery parameters: The real-time voltage, current and temperature of the battery are important bases for judging the battery status and adjusting the charging parameters; (2) Charging strategy: When the battery temperature is higher than 50 degrees, charging is suspended to prevent thermal runaway; when the battery voltage reaches the preset constant voltage (the single cell voltage reaches 3.7V), it is necessary to switch to the interval stage; Third, dynamically adjust the charging parameters: (3) Voltage adjustment: In the equalization mode (stabilized voltage charging) stage, the charging system will maintain a constant voltage and make fine adjustments according to the actual state of the battery; when the battery temperature is higher than 35 degrees, the battery temperature is reduced by reducing the charging voltage to 58V; when the temperature is continuously (10 minutes) below 35 degrees, the voltage is adjusted to 58.4V to maintain charging efficiency; (4) Current adjustment: As the charging process proceeds, the battery's ability to receive current will gradually decrease; therefore, in the equalization mode (stabilized voltage charging) stage, the charging current will gradually decrease.

[0043] Fourth, solve the following problems: (1) Overcharging problem: By keeping the voltage constant and allowing the charging current to gradually decrease during the equalization mode (voltage-stabilized charging) stage, the battery can be effectively prevented from being overcharged. When the battery voltage reaches the preset constant voltage, the battery power will no longer increase significantly even if charging continues, thus avoiding the risk of overcharging. (2) Overheating problem: Prevent the battery from overheating by monitoring the battery temperature and reducing the charging voltage or suspending charging when necessary. The monitoring device also controls the fan to lower the battery temperature based on the detected temperature. (3) Charging efficiency problem: In the equalization mode (voltage-stabilized charging) stage, although the charging current gradually decreases, the battery can still receive electrical energy at a higher efficiency due to the constant voltage.

[0044] In one embodiment, the S4, stopping charging of the first battery module until the charging condition indicator meets the first starting condition, includes: stopping charging of the first battery module, leaving the first battery module stationary so that the charging condition indicator of the first battery module changes over time until the charging condition indicator meets the first starting condition.

[0045] In the above step S4, charging of the first battery module is stopped, that is, the gap stage, especially when the battery is close to being fully charged, to ensure the safety of the battery and optimize the battery life; the following is a detailed supplementary description of the control logic, decision basis and problem solving in the gap stage:

[0046] First, control logic: (1) Entering the gap stage: When the battery reaches the first termination condition in the equalization charging mode (voltage-stabilized charging) stage, condition 1 presets the current threshold preset equalization charging protection time (default 24 hours), condition 2 charging voltage reaches the set value and the charging current is less than 0.01C, condition 3 charging current is less than 0.01C10 and the duration is greater than the set value (default 3 hours), condition 4 rectifier module communication is completely interrupted, condition 5 system abnormality, when one of the above conditions 1 to 5 is met, that is, the "first termination condition" is reached or met, the charging system will enter the gap stage; (2) Pause charging: In the gap stage, the charging system suspends charging the battery so that the chemical reaction inside the battery reaches a balanced state and reduces the pressure inside the battery; (3) Restart charging: After a preset time interval (default 90 days) or the voltage of the entire group is lower than 51.2V, the conditions change to a certain extent. At this time, the battery module meets the "first start condition" and the charging system restarts charging according to the battery status and charging strategy.

[0047] Second, decision-making basis: (1) Battery status: Battery voltage, current, temperature and time are important parameters for deciding whether to enter the intermittent phase and when to restart charging. Third, problem solving: (1) Overheating problem: By pausing charging during the intermittent phase and extending the intermittent time, the battery temperature can be effectively reduced to prevent overheating; (2) Battery life problem: Allowing the internal chemical reaction of the battery to reach a balanced state during the intermittent phase can reduce the pressure accumulation inside the battery, thereby extending the battery life.

[0048] In one embodiment, the S5 restarts charging and enters a pre-current limiting stage until the first battery module reaches an expected charging completion state, including: calculating an initial pre-limited current based on the current at the current limiting point and the load current; restarting charging with the initial pre-limited current as the starting point, entering the pre-current limiting stage, and then adjusting the state of the first battery module according to a first adjustment rule until the first battery module reaches the expected charging completion state; the first adjustment rule is to ensure that the battery is fully charged and allow current changes.

[0049] In the above step S5, charging is restarted and enters the pre-current limiting stage, which is used to ensure the safety of the charging process and optimize the battery performance at the initial stage of battery charging; the following is a detailed supplementary description of the control logic, decision basis, and how to solve the problem by dynamically adjusting the charging parameters in the pre-current limiting stage:

[0050] First, control logic: (1) Initial stage: When the charging process begins, the charging system first enters the pre-current limiting stage; in this stage, the charging system will limit the size of the charging current to avoid damage to the battery due to excessive initial charging current; (2) Monitoring and judgment: The charging system will monitor the battery's voltage, current, temperature, and internal state in real time to determine whether the battery is in a safe and rechargeable state; (3) Current limitation: According to the battery characteristics and charging strategy, the charging system will set an initial charging current limit value; the limit value is (battery charging current limit point 0.3C × 0.8 + (4) Dynamic adjustment: As the charging process progresses, the charging system will dynamically adjust the charging current according to the real-time status of the battery. When the battery temperature is higher than 35 degrees, the battery temperature is lowered by reducing the charging current to 0.1C. When the temperature is continuously (10 minutes) below 35 degrees, the voltage is adjusted to 0.3C×0.8 to maintain the charging efficiency. If the battery voltage fluctuates abnormally during the charging process (cell voltage is 3.65V, lower than 2.0V, cell voltage rises by 0.1V / minute, or drops by more than 0.1V / minute), charging should be suspended.

[0051] Second, dynamically adjust the charging parameters: (1) Current adjustment: In the pre-current limiting stage, the charging current is dynamically adjusted; the charging system will adjust the charging current according to the real-time status of the battery (such as voltage, current, temperature, etc.); if the battery temperature rises or the voltage approaches the preset value, the charging current may gradually decrease to prevent overcharging or overheating; (2) Time adjustment: In addition to current and voltage, charging time is also an adjustment parameter that can be considered; in some cases, if the battery is in good condition and the charging strategy focuses on speed, the pre-current limiting stage can be shortened; if the battery is in poor condition or the charging strategy focuses on safety, the pre-current limiting stage can be extended to ensure that the battery is fully charged and avoid overcharging.

[0052] Third, solve the following problems: (1) Overheating problem: By dynamically adjusting the charging current and voltage, the battery temperature can be effectively controlled to prevent overheating. Especially in the pre-current limiting stage, appropriate current limitation can ensure that the battery will not overheat due to excessive current in the initial charging stage. (2) Overcharging problem: By limiting the charging current in the pre-current limiting stage, the battery can be effectively prevented from overcharging. At the same time, as the charging process proceeds, by dynamically adjusting the charging parameters, the battery can be charged within a safe range and overcharging can be avoided. (3) Battery life problem: By accurately controlling the charging parameters in the pre-current limiting stage, the battery can be fully protected during the charging process, thereby extending the battery life. Especially in the initial charging stage of the battery, appropriate current limitation can avoid damage to the battery due to excessive charging current.

[0053] In one embodiment, the present invention further proposes a hydropower station intelligent inspection method, wherein the hydropower station intelligent inspection method is used for an intelligent mobile charging unit to realize inspection and charging inside the hydropower station, wherein multiple dedicated devices inside the hydropower station are equipped with multiple battery modules; see Figure 2 As shown, the hydropower station intelligent inspection method is based on the intermittent lithium battery charging control method as described in any of the above embodiments. After the first battery module reaches the expected charging completion state, the hydropower station intelligent inspection method further includes:

[0054] S801, maintaining the position and distance of the intelligent mobile charging unit relative to the first battery module unchanged, and after waiting for a preset time, checking whether the parameters of the first battery module deviate from the preset parameters.

[0055] S802: If the parameters of the first battery module detected deviate from the preset parameters, the inspection of the first battery module is stopped and an alarm signal is issued.

[0056] In one embodiment, see Figure 2 As shown, the hydropower station intelligent inspection method also includes:

[0057] S803, if it is checked that the parameters of the first battery module do not deviate from the preset parameters, the past charging records stored in the storage unit are retrieved, and the second battery module whose past charging time has the largest interval from the current moment is screened out, and the third battery module whose past charging time has the second smallest interval from the current moment is screened out.

[0058] S804, calculating the coordinate position of the second battery module relative to the hydropower station, the coordinate position of the third battery module relative to the hydropower station, and the center position between the two, and taking the standard docking area closest to the center position as the target position for the next move.

[0059] S805a, moving towards the target position of the next move. If there is no charging demand from the battery module in the hydropower station during the movement, the target is kept unchanged until entering the standard docking area.

[0060] In the above scheme, the standard docking area closest to the center position is used as the target position for the next movement. The standard docking area can be set by the staff of the large hydropower station according to the standard requirements. For example, it can be a corner or the edge of an aisle. After the smart mobile charging unit is docked and stationary, the space occupied does not hinder the normal operation of the large hydropower station.

[0061] In one embodiment, see Figure 3 As shown, the hydropower station intelligent inspection method also includes:

[0062] S805b, moving towards the target position of the next move, if a battery module in the hydropower station issues a charging demand during the movement, the transfer target is the fourth battery module that issues the charging demand, until it moves to the chargeable position on the side of the fourth battery module, and executes the intermittent lithium battery charging control method. The beneficial effect of the above scheme is that it can realize the reasonable planning of intelligent emergency charging of the hydropower station, ensuring that the time to arrive at the charging site is controlled within an acceptable range when the next emergency charging demand occurs.

[0063] In summary, the present invention proposes an intermittent lithium battery charging control method and a hydropower station intelligent inspection method, which solves the problems existing in the prior art, improves charging efficiency, safety, adaptability and user experience, and provides strong technical support for the widespread application of lithium batteries. The beneficial effects of this application mainly include the following aspects.

[0064] First, improve charging efficiency: By introducing an intermittent charging strategy, optimizing the regulation of charging current and voltage, and reducing the generation of heat inside the battery, the charging efficiency is improved and the charging time is shortened.

[0065] Second, enhance safety: By precisely controlling the current and voltage during the charging process, safety hazards such as battery overcharging and overheating can be avoided, ensuring the charging process is safe and reliable.

[0066] Third, enhanced adaptability: The intermittent charging control method of the present invention can dynamically adjust the charging parameters according to the actual state and usage conditions of the battery to adapt to the charging needs under different environments and improve the adaptability and stability of the charging system.

[0067] Fourth, improve user experience: By providing fast charging function and real-time feedback and prompts during the charging process, it meets users' needs for charging speed and convenience and improves user experience.

[0068] Example 2

[0069] See also Figure 4 , Figure 4 The block diagram of an electronic device provided by the present invention. The electronic device can be a terminal or a server, wherein the terminal can be an electronic device with communication function such as a smart phone, a tablet computer, a laptop computer, a desktop computer, a personal digital assistant, and a wearable device. The electronic device includes a processor 111, a communication interface 112, a memory 113, and a communication bus 114, wherein the processor 111, the communication interface 112, and the memory 113 communicate with each other through the communication bus 114.

[0070] The memory 113 is used to store computer programs.

[0071] In one embodiment of the present invention, the processor 111 is used to implement the method provided by any one of the aforementioned method embodiments when executing the program stored in the memory 113 .

[0072] It should be understood that in the embodiment of the present application, the processor 111 may be a central processing unit (CPU), and the processor 502 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0073] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions, but such implementation should not be considered to be beyond the scope of the present invention.

[0074] In the several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of each unit is only a logical function division, and there may be other division methods in actual implementation. For example, units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0075] The steps in the method of the embodiment of the present invention can be adjusted in order, combined and deleted according to actual needs. The units in the device of the embodiment of the present invention can be combined, divided and deleted according to actual needs. In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0076] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, terminal, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention.

[0077] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0078] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0079] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for controlling intermittent lithium battery charging, characterized in that: The method is used to realize charging of a first battery module, the first battery module is connected to a monitoring unit, the monitoring unit is in a powered-on state and is used to monitor the first battery module; The intermittent lithium battery charging control method comprises: S1, charging the first battery module in a pre-charging mode until a parameter of the first battery module reaches a preset voltage value; S2, charging the first battery module in a steady current charging state until the parameter of the first battery module reaches a regulated upper limit voltage; S3, charging the first battery module in a voltage-stabilized charging state until the state of the first battery module meets a first termination condition; S4, stopping charging of the first battery module until the charging condition indicator meets the first starting condition; S5, restarting charging and entering a pre-current limiting stage until the first battery module reaches an expected charging completion state.

2. The intermittent lithium battery charging control method according to claim 1, characterized in that: The step S1, charging the first battery module in a pre-charging mode until a parameter of the first battery module reaches a preset voltage value, includes: Obtaining a nominal voltage of the first battery module, reducing the nominal voltage by a preset fine-tuning ratio, and obtaining a nominal lower limit voltage; The first battery module is pre-charged with a preset first charging current as a charging condition indicator, so that the charging dynamic voltage gradually increases until the charging dynamic voltage reaches a nominal lower limit voltage.

3. The intermittent lithium battery charging control method according to claim 2, characterized in that: The step S2, charging the first battery module in a steady current charging state until the parameters of the first battery module reach a regulated upper limit voltage, includes: Amplifying the first charging current by a preset factor to obtain a second charging current; Based on the nominal voltage, the voltage value is adjusted to increase to obtain the upper limit voltage of the voltage regulation; The first battery module is charged with a steady current using the second charging current as a charging condition indicator, so that the charging dynamic voltage gradually increases until the charging dynamic voltage reaches a regulated upper limit voltage.

4. The intermittent lithium battery charging control method according to claim 3, characterized in that: The step S3, charging the first battery module in a voltage-stabilized charging state until the state of the first battery module meets a first termination condition, includes: Taking the voltage stabilization upper limit voltage as the charging condition indicator, the first battery module is charged with a stabilization voltage, and the voltage is kept stable under the state of unstable current, until the state of the first battery module meets the first termination condition.

5. The intermittent lithium battery charging control method according to claim 4, characterized in that: The step S4, stopping charging of the first battery module until the charging condition indicator meets the first start condition, includes: The charging of the first battery module is stopped, and the first battery module is left to stand so that the charging condition indicator of the first battery module changes over time until the charging condition indicator meets the first starting condition.

6. The intermittent lithium battery charging control method according to claim 5, characterized in that: S5, restarting charging and entering the pre-current limiting stage until the first battery module reaches the expected charging completion state, includes: Calculate the initial pre-limit current according to the current limit point current and the load current; Restart charging with the initial pre-limited current as the starting point, enter the pre-limited current stage, and then adjust the state of the first battery module according to the first adjustment rule until the first battery module reaches the expected charging completion state; the first adjustment rule is to ensure that the battery is fully charged and allow current changes.

7. The intermittent lithium battery charging control method according to claim 6, characterized in that: The calculating of the initial pre-limited current according to the current limiting point current and the load current comprises: Collecting a current value of a current limiting point and a second current value of a load; According to the result of the current limit point current value of 0.3C, a first current value is obtained; The initial pre-limited current is calculated by the following formula: the first current value A1 multiplied by 0.8 plus the second current value A2 equals the initial pre-limited current As.

8. A hydropower station intelligent inspection method, characterized in that: The intelligent inspection method of the hydropower station is used for an intelligent mobile charging unit to realize inspection and charging inside the hydropower station, and multiple special equipment inside the hydropower station is equipped with multiple battery modules; the intelligent inspection method of the hydropower station is based on the intermittent lithium battery charging control method according to any one of claims 1 to 7, and after the first battery module reaches the expected charging completion state, the intelligent inspection method of the hydropower station also includes: Keeping the position and distance of the intelligent mobile charging unit relative to the first battery module unchanged, after waiting for a preset time, checking whether the parameters of the first battery module deviate from the preset parameters; If the parameters of the first battery module detected deviate from the preset parameters, the inspection of the first battery module is stopped and an alarm signal is issued.

9. The intelligent inspection method for a hydropower station according to claim 8, characterized in that: The intelligent inspection method for a hydropower station also includes: If it is checked that the parameters of the first battery module do not deviate from the preset parameters, the past charging records stored in the storage unit are retrieved to select the second battery module whose past charging time has the largest interval from the current moment, and the third battery module whose past charging time has the second smallest interval from the current moment; Calculate the coordinate position of the second battery module relative to the hydropower station, the coordinate position of the third battery module relative to the hydropower station, and the center position between the two, and use the standard docking area closest to the center position as the target position for the next move; Move toward the target position of the next move. If there is no charging demand from the battery module in the hydropower station during the move, keep the target unchanged until entering the standard docking area.

10. The intelligent inspection method for a hydropower station according to claim 9, characterized in that: The intelligent inspection method for a hydropower station also includes: Move toward the target position of the next movement. If a battery module in the hydropower station issues a charging demand during the movement, the transfer target is the fourth battery module that issues the charging demand, until it moves to a chargeable position on one side of the fourth battery module, and executes the intermittent lithium battery charging control method.

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